IBM TotalStorage NAS 300 User Reference page 141

2. To locate the LEDs on the system board see Figure 12 on page 129.
3. Check the System Event/Error Log for additional information before replacing a
4. The DIMM-error LEDs, processor-error LEDs, and VRM-error LEDs turn off
Table 21. Errors diagnosed by the diagnostic panel LEDs
Diagnostics panel LED
All LEDs off (Check System Error
Log for error condition, then clear
System Error Log when the
problem is found.)
MEMORY LED on (The LED next
to the failing DIMM is on.)
CPU LED on (The LED next to the
failing CPU is on.)
PCI BUS LED on
VRM LED on (The LED next to the
failing VRM is on.)
DASD LED on (The LED located
next to the drive bay that the failing
drive is installed in is lit. Check the
amber drive LED for the failing hard
drive.)
SERVICE PROCESSOR BUS LED 1. Unplug the power supplies from the engine for 30 seconds, and then plug in
POWER SUPPLY 1 LED on
POWER SUPPLY 2 LED on
NONREDUNDANT LED on
NMI LED on
FRU.
when the system is shut down.
Part/action
1. System Error Log is 75% full; clear the log.
2. PFA alert; check log for failure; clear PFA alert; remove ac power for at
least 20 seconds, reconnect, and then turn on the system.
3. Run light path diagnostics.
1. Failing DIMM
2. System board
1. Microprocessor 1 or 2
2. System board
1. Remove all PCI adapters from slots on affected bus (refer to "Adapters" in
Chapter 3 of the hardware installation guide).
2. System board.
1. Voltage regulator module indicated by the lit VRM LED.
2. Microprocessor indicated by the microprocessor LED.
1. Be sure that the fans are operating correctly and the airflow is good.
2. If installed, reseat I
the system board (J10).
3. Failing drive. SCSI channel A has failed. (This is the SCSI channel for the
hot-swap hard disk drives).
4. SCSI backplane.
and retry.
2. Reflash or update firmware for ISMP, BIOS.
3. System board.
1. Check the dc good LED on power supply 1. If it is off, replace power supply
1.
2. Power cage assembly.
1. Check the dc good LED on power supply 2. If it is off, replace power supply
2.
2. Power cage assembly.
1. Check the PS1 and PS2 LEDs and replace any indicated power supply.
2. Install an additional power supply or remove optional devices from the
engine.
1. Restart the engine.
2. Check the System Error Log.
2
C cable between DASD backplane and DASD I
Appendix D. Symptom-to-part index
2
C on
127